<h1 style="height: 50px">Main Component</h1>
<div id="username">Hello {{username}} from Angular 2!</div>
<button (click)="click()">Up</button><br>
<label>Count:</label>
<div id="counter">{{counter}}</div>
<label>AsyncCounter:</label>
<div id="asyncCounter">{{asyncCounter}}</div>
<input [(ngModel)]="input" id="input" aria-label="input">
<div id="value">Input: {{input}}</div>
<textarea id="memo" aria-label="memo">{{memo}}</textarea>
<test-sub title="test tools" [items]="testTools"></test-sub>
<test-sub title="test methods" [items]="testMethods"></test-sub>
